1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A metallic rod of length $$'\ell '$$ is tied to a string of length $$2$$$$\ell $$ and made to rotate with angular speed $$w$$ on a horizontal table with one end of the string fixed. If there is a vertical magnetic field $$'B'$$ in the region, the $$e.m.f$$ induced across the ends of the rod is JEE Main 2013 (Offline) Physics - Electromagnetic Induction Question 114 English
A
$${{2B\omega \ell } \over 2}$$
B
$${{3B\omega \ell } \over 2}$$
C
$${{4B\omega {\ell ^2}} \over 2}$$
D
$${{5B\omega {\ell ^2}} \over 2}$$
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Diameter of a plano-convex lens is $$6$$ $$cm$$ and thickness at the center is $$3mm$$. If speed of light in material of lens is $$2 \times {10^8}\,m/s,$$ the focal length of the lens is
A
$$15$$ $$cm$$
B
$$20$$ $$cm$$
C
$$30$$ $$cm$$
D
$$10$$ $$cm$$
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A circular loop of radius $$0.3$$ $$cm$$ lies center of the small loop is on the axis of the bigger loop. The distance between their centers is $$15$$ $$cm.$$ If a current of $$2.0$$ $$A$$ flows through the smaller loop, than the flux linked with bigger loop is
A
$$9.1 \times {10^{ - 11}}\,$$ weber
B
$$6 \times {10^{ - 11}}\,$$ weber
C
$$3.3 \times {10^{ - 11}}\,$$ weber
D
$$6.6 \times {10^{ - 9}}\,$$ weber
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Two short bar magnets of length $$1$$ $$cm$$ each have magnetic moments $$1.20$$ $$A{m^2}$$ and $$1.00$$ $$A{m^2}$$ respectively. They are placed on a horizontal table parallel to each other with their $$N$$ poles pointing towards the South. They have a common magnetic equator and are separated by a distance of $$20.0$$ $$cm.$$ The value of the resultant horizontal magnetic induction at the mid-point $$O$$ of the line joining their centres is close to $$\left( \, \right.$$ Horizontal component of earth's magnetic induction is $$3.6 \times 10.5Wb/{m^2})$$
A
$$3.6 \times 10.5\,\,Wb/{m^2}$$
B
$$2.56 \times 10.4\,\,Wb/{m^2}$$
C
$$3.50 \times 10.4\,\,Wb/{m^2}$$
D
$$5.80 \times 10.4\,Wb/{m^2}$$
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